COLLATERAL READING 95 



appears opposite the year in which it is grown on that field. The 

 purpose of this explanation is to point out more clearly the steps to 

 be followed in a system of rotation. 



A four-year rotation as indicated would demand a liberal feeding 

 of the crops and careful application of the manure. Timothy is 

 usually sown with clover and the field generally left for two years. 

 Some farmers eliminate oats as much as possible by drilling wheat in 

 the standing corn or after the corn is cut for fodder. 



COLLATERAL READING: 



Iowa Climate and Crops, 



Iowa Year Book of Agriculture, 1903, pp. 121-157. 

 Relation of Precipitation to Yield of Corn, 



J. Warren Smith, Year Book U. S. Department of Agri- 

 culture, 1903. 

 The Experiment Stations and Corn Culture, 



J. I. Schulte in Am. Rep. 1904, Office Experiment Station, 

 U. S. Department of Agriculture. 

 Influence of Environment on the Chemical Composition of 

 Plants, 



Wiley, Year Book IT. S. Department, 1901, pp. 299-318. 

 Indian Corn, 



Bulletin No. 147, Kansas Experiment Station. 

 Effect of Manures upon Composition of Corn, 



Connecticut Experiment Station Report 1895, P^&c 125, 

 1896, page 315. 

 Practices in Crop Rotation, 



Year Book U. S. Department of Agriculture, 1902, pp. 



519-532. 

 Thirty Years of Crop Rotation, 



Illinois Station Bulletin No. 125. 

 Soil Areas of Iowa, 



Iowa Station Bulletin No. 82. 

 Maintenance of Soil Fertility, 



Iowa Station Bulletin No. 96. 

 Studies of Rotations, Humus, Etc., 



Minnesota Station Bulletins Nos. 89-94. 

 Various Articles in Fifteenth Biennial Report of Kansas State 



Board of Agriculture, 1905-6, pp. 1-242. 

 Cereals of America, 



Hunt, Chapter XII, 



